# -*- coding: utf-8 -*-
# @Time    : 2020/12/31 下午3:09
# @Author  : tgy


def test01():
    pass
    name = 'zhangsan'
    print(name)
    del name
    name = 123
    print(type(name))
    print(id(name))
    score = 1.4
    print(type(score))
    names = ['1', '2']
    print(type(names))
    person = {'name': 'zhangsan', 'age': 21}
    print(type(person))


def test02():
    pass
    name1 = 'aaa'
    name2 = 'aaa'
    if name1 is name2:
        pass
        print("is")
    age = -100000
    opt = -100000
    print(id(age))
    print(id(opt))


def test03():
    pass
    name = 'zhangsan'
    message = name + '111'
    print(message)


def test04():
    pass
    names = ['1', 2, 3]
    for name in names:
        pass
    person = {'name': 'zhangsan', 'age': 21}

import math

def math_test():
    ...
    print(math.pi)


if __name__ == '__main__':
    """
    是什么，为什么，如何用
    """
    math_test()
    pass
    # test01()
    # my_child = '111'
    # print(10 * 'a')
    # print(type(my_child))
